Rex Murphy: Sing along with Fidel, sensitive souls, and you won't hear the Cubans' screams

We haven't had many caring summits lately. Ten, twenty, thirty years ago hardly a summer went by when there wasn't some blatantly over-hyped rock-star-cum-celebrity festival given over to the defeat of the world's most intractable problems. These were dedicated to the proposition that it was due only to the perfidy of politicians and diplomats, and the…